Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Duplicate address discovery

To determine if an IPv6 unicast address is unique before assigning it to an interface, an OS10 switch sends a neighbor solicitation message. If the process of duplicate address discovery (DAD) detects a duplicate address in the network, the address does not configure on the interface. DAD is enabled by default.

By default, IPv6 is not disabled when a duplicate address is detected. Only the duplicate address is not applied. Other IPv6 addresses are still active on the interface.

To disable IPv6 on an interface when a duplicate link-local address is detected, use the ipv6 nd dad disable-ipv6-on-failure command. To re-enable IPv6 after you resolve a duplicate link-local address, enter no ipv6 enable, then the ipv6 enable command.

• Disable or re-enable IPv6 duplicate address discovery in Interface mode.

  ipv6 nd dad {disable | enable}

• Disable IPv6 on an interface if a duplicate link-local address is discovered in Interface mode.

  ipv6 nd dad disable-ipv6-on-dad-failure

Disable duplicate address discovery

OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable

Disable IPv6 for duplicate link-local address

OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ipv6 nd dad disable-ipv6-on-dad-failure